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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1093fa12430bb0afc9a2a0facd971ad5f6f98ce052c47964ed0214f553e262' 
  AND token = 'aYM5Pzohg9gCvsRB1KRz23QreyaVqlgfTwnAkkp2E7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}